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Molecular Diagnostics - Polymerase Chain Reaction
Molecular Exam 3 Lecture 15
52
Biology
Undergraduate 3
02/24/2015

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Term
Billions of copies can be made from how many copies of target DNA?
Definition
1
Term
What are the following considered:
Detect MOs
Detect Gene Defect
Forensics
Transplants (HLA typing)
Definition
Applications of PCR & PCR variations
Term
What are the components needed for PCR?
Definition
DNA target
2 Primers
Taq DNA polymerase
Deoxynucleotide triphosphates
Buffer with Mg+2
Term
Why do you use a buffer with Magnesium +2?
Definition
For proper pH & Mg, which is needed for polymerase
Term
What is the temperature at which Maximum activity occurs with the Taq DNA polymerase?
Definition
70-80 degrees Celsius
Term
What is the temperature at which 10% activity occurs with the Taq DNA polymerase?
Definition
37 degrees Celsius
Term
What is the temperature at which activity gradually becomes inactivated with the Taq DNA polymerase?
Definition
95 degrees Celsius
Term
What is the optimum growth temperature for Taq DNA polymerase?
Definition
72 degrees Celsius
Term
True or False:
Taq DNA Polymerase can survive higher temperatures than 70 degrees Celsius, including boiling water
Definition
True
Term
Taq DNA Polymerase is isolated from what?
Definition
Thermus aquaticus
Term
At what temperature does Denaturation occur?
Definition
94 degrees Celsius
Term
What happens during Denaturation?
Definition
Separate strands by breaking hydrogen bonds
Term
At what temperature does Annealing occur?
Definition
55-65 degrees Celsius
Term
What happens during Annealing?
Definition
Primer hybridization
Primers anneal to denatured DNA strands
Term
At what temperature does Elongation occur?
Definition
72 degrees Celsius
Term
What happens during Elongation?
Definition
Taq DNA Polymerase synthesizes new complementary DNA strands
Term
How many times is the Cycle repeated?
Definition
20-40
Term
About how much time occurs per step?
Definition
30-60 seconds
Term
About how much time occurs per cycle?
Definition
5 minutes
Term
Denaturation - In vivo
Definition
Helicase
Term
Denaturation - In vitro
Definition
Heat (94 degrees Celsius)
Term
What does Hydrogen bond formation require?
Definition
Energy
Term
True or False:
The more G-C the lower the annealing temperature needs to be?
Definition
False
Term
True or False:
The more G-C the higher the annealing temperature needs to be?
Definition
True
Term
1 Temperature Cycle =
Definition
Denaturation + Annealing + Elongation/Extension
Term
With the Thermal Cycler how many cycles are performed in the same tube?
Definition
20-40
Term
True or False:
The target sequence doubles with each cycle
Definition
True
Term
At the end of Cycle three how many fragments of desired length (precise length fragments) are present.
Definition
2
Term
At the end of Cycle four how many fragments of desired length (precise length fragments) are present.
Definition
8
Term
True or False:
At the end of cycle 19 there have been over 500,000 DNA copies present.
Definition
True
Term
About how long does it take to make millions of copies of specific DNA sequence?
Definition
2 hours
Term
What type of increase is seen in the number of target DNA sequences?
Definition
Exponential
Term
What is an Amplicon?
Definition
PCR product used for detection and analysis
Term
Standard PCR can amplify up to how many bp?
Definition
1000
Term
With modification, Standard PCR can amplify up to how many bp?
Definition
2,000-3,000
Term
True or False:
Amplicons are abundant in PCR lab
Definition
True
Term
Preventing cross contamination is very important, otherwise what can happen?
Definition
False results
Term
What are the following considered:
Aerosols from popping top off microcentrifuge tube
Aerosols pulled into pipettes
Droplets on hand going everywhere
Definition
Ways in which DNA spreads
Term
What is in the Master Mix?
Definition
Taq DNA Polymerase
dNTPs
Primers
Buffer
Term
What are the 3 work areas?
Definition
Reagent area
Extraction area
PCR area
Term
What happens in the Extraction area?
Definition
Patient samples are processed
Term
Is work flow unidirectional or bidirectional?
Definition
unidirectional
Term
What is the direction of the work flow?
Definition
Reagent --> Extraction --> PCR
Term
You should store reagent in what volume?
Definition
Small aliquots; discard aliquot after 1 use
Term
True or False:
Discard aliquot after 1 use
Definition
True
Term
What type of tips should you use for pipettes?
Definition
ART (Aerosol Resistant Tips)
Term
What kind of ware should you use to reduce contamination?
Definition
Disposable plastic
Term
What should you clean areas with?
Definition
2-10% Bleach
Term
What will 2-10% bleach destroy?
Definition
Nucleic acids
Term
How many specimen tubes should you have open at a time?
Definition
1
Term
True or False:
Keep tops on reagents as much as possible
Definition
True
Term
What should you do to the tubes before opening to decrease aerosols?
Definition
Pulse spin tubes
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